# Civil Engineering - Surveying - Discussion

Discussion Forum : Surveying - Section 1 (Q.No. 2)
2.
If h is the difference in level between end points separated by l, then the slope correction is . The second term may be neglected if the value of h in a 20 m distance is less than
m
1 m
2 m
3 m
Explanation:
No answer description is available. Let's discuss.
Discussion:
67 comments Page 7 of 7.

Ramu said:   10 years ago

From answer verification, If we substitute 1/2 in second term then it will negligible compared to other.

Rashmi said:   10 years ago
How 3.30?

Nanda said:   10 years ago
@Vijay patel.

h2 = 2*20
h square = 40.
How come h = 3.3?

VIVEK CHANDEL said:   1 decade ago
For slopes of 10 percent or less, the correction to be applied to L for a difference d in elevation between tape ends, or for a horizontal offset d between tape ends, may be computed from,

Cs=(h^2)/(2L).

For a slope greater than 10 percent, Cs may be determined from,
Cs={(h^2)/(2L)}+{(h^4)/8(L^3)}.

If we use any value lesser than 3 and not greater than 3, then answer for slope correction either using the complete formula given above or by eliminating the second term, we will get the same answer. Thus it means that the second term can be eliminated the right answer is 3 and distance kept as 20m.

Would you please explain the calculations! Why are you taken that h2/2l=1?

Vijay patel said:   1 decade ago
Second term neglect and l = 20.

So h2 = 2L.

h2 = 2*20.

h = 3.3m.

Near equal to 3m.